The Nets started their preseason slate Saturday with a numbers crunch and crowded roster.

They’ll end it weeks from now with a fight right up to Opening Night for the final spot of the team.

That fight may include Tyrese Martin.

Nets players have almost universally offered up unbidden praise for Martin, gushing over his play in offseason runs and training camp practices.

And Brooklyn has held him up as an example to its youngsters of how to carry themselves, how to fight for their jobs.

But Martin knows his own job is nowhere near safe. Not yet.

“I’d never say I’m actually on a solid footing, you know?” said Martin, on a nonguaranteed $2.2 million deal. “Even when things are guaranteed, stuff’s still not guaranteed, especially in this business. So that’s just been my mindset all the

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